Android学习笔记进阶之在图片上涂鸦(能清屏)

2013-11-19 10:52 117人阅读评论(0) 收藏举报

HandWritingActivity.java

package xiaosi.handWriting;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class HandWritingActivity extends Activity
{
/** Called when the activity is first created. */
private HandWrite handWrite = null;
private Button clear = null;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
handWrite = (HandWrite)findViewById(R.id.handwriteview);
clear = (Button)findViewById(R.id.clear);
clear.setOnClickListener(new clearListener());
}
private class clearListener implements OnClickListener{
public void onClick(View v)
{
handWrite.clear();
}
}
}

package xiaosi.handWriting;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class HandWritingActivity extends Activity
{
/** Called when the activity is first created. */
private HandWrite handWrite = null;
private Button clear = null;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
handWrite = (HandWrite)findViewById(R.id.handwriteview);
clear = (Button)findViewById(R.id.clear);
clear.setOnClickListener(new clearListener());
}
private class clearListener implements OnClickListener{
public void onClick(View v)
{
handWrite.clear();
}
}
}

HandWrite.java

public class HandWrite extends View
{
private Paint paint = null;
private Bitmap originalBitmap = null;
private Bitmap new1Bitmap = null;
private Bitmap new2Bitmap = null;
private float clickX = 0,clickY = 0;
private float startX = 0,startY = 0;
private boolean isMove = true;
private boolean isClear = false;
private int color = Color.GREEN;
private float strokeWidth = 2.0f;
public HandWrite(Context context, AttributeSet attrs)
{
super(context, attrs);
originalBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.girl_a);
new1Bitmap = Bitmap.createBitmap(originalBitmap);
}
public void clear(){
isClear = true;
new2Bitmap = Bitmap.createBitmap(originalBitmap);
invalidate();
}
public void setstyle(float strokeWidth){
this.strokeWidth = strokeWidth;
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
canvas.drawBitmap(HandWriting(new1Bitmap), 0, 0,null);
}
public Bitmap HandWriting(Bitmap originalBitmap)
{
Canvas canvas = null;
if(isClear){
canvas = new Canvas(new2Bitmap);
}
else{
canvas = new Canvas(originalBitmap);
}
paint = new Paint();
paint.setStyle(Style.STROKE);
paint.setAntiAlias(true);
paint.setColor(color);
paint.setStrokeWidth(strokeWidth);
if(isMove){
canvas.drawLine(startX, startY, clickX, clickY, paint);
}
startX = clickX;
startY = clickY;
if(isClear){
return new2Bitmap;
}
return originalBitmap;
}
@Override
public boolean onTouchEvent(MotionEvent event)
{
clickX = event.getX();
clickY = event.getY();
if(event.getAction() == MotionEvent.ACTION_DOWN){
isMove = false;
invalidate();
return true;
}
else if(event.getAction() == MotionEvent.ACTION_MOVE){
isMove = true;
invalidate();
return true;
}
return super.onTouchEvent(event);
}
}

public class HandWrite extends View
{
private Paint paint = null;
private Bitmap originalBitmap = null;
private Bitmap new1Bitmap = null;
private Bitmap new2Bitmap = null;
private float clickX = 0,clickY = 0;
private float startX = 0,startY = 0;
private boolean isMove = true;
private boolean isClear = false;
private int color = Color.GREEN;
private float strokeWidth = 2.0f;
public HandWrite(Context context, AttributeSet attrs)
{
super(context, attrs);
originalBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.girl_a);
new1Bitmap = Bitmap.createBitmap(originalBitmap);
}
public void clear(){
isClear = true;
new2Bitmap = Bitmap.createBitmap(originalBitmap);
invalidate();
}
public void setstyle(float strokeWidth){
this.strokeWidth = strokeWidth;
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
canvas.drawBitmap(HandWriting(new1Bitmap), 0, 0,null);
}
public Bitmap HandWriting(Bitmap originalBitmap)
{
Canvas canvas = null;
if(isClear){
canvas = new Canvas(new2Bitmap);
}
else{
canvas = new Canvas(originalBitmap);
}
paint = new Paint();
paint.setStyle(Style.STROKE);
paint.setAntiAlias(true);
paint.setColor(color);
paint.setStrokeWidth(strokeWidth);
if(isMove){
canvas.drawLine(startX, startY, clickX, clickY, paint);
}
startX = clickX;
startY = clickY;
if(isClear){
return new2Bitmap;
}
return originalBitmap;
}
@Override
public boolean onTouchEvent(MotionEvent event)
{
clickX = event.getX();
clickY = event.getY();
if(event.getAction() == MotionEvent.ACTION_DOWN){
isMove = false;
invalidate();
return true;
}
else if(event.getAction() == MotionEvent.ACTION_MOVE){
isMove = true;
invalidate();
return true;
}
return super.onTouchEvent(event);
}
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<xiaosi.handWriting.HandWrite
android:id="@+id/handwriteview"
android:layout_width="fill_parent"
android:layout_height="380dp" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:gravity="center_horizontal" >
<Button
android:id="@+id/clear"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="清屏" />
</LinearLayout>
</LinearLayout>

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